Analysis of Ionospheric and Geomagnetic Response to the 2020 Patagonian Solar Eclipse

Total solar eclipses are unique opportunities to study how the ionospheric and external geomagnetic field responds fast changes in ionizing flux as moon’s shadow travels through its path over ionosphere at an average speed of 3,000 km/h. In this contribution, we describe our observing campaign which set up GNSS stations city Valcheta, Río Negro, Argentina (which was located right under totality). We also results obtained from analysis combination on-site data together with publicly available observations geodetic observatories. The large span latitude allowed us analyze different magnitudes drop vertical total electron content (?VTEC) varying occultation percentages. found expected reduction move away totality but detected a new increment ?VTEC got closer Earth’s Magnetic Equator. compared variations predictions that were based on Ashour-Chapman model find overall good agreement, although ?20 min delay eclipse maximum is evident beyond uncertainties. This suggests presence processes response lower loss photoionization flux.